Introduction to Data Interpretation
Direction: Study the following histogram of marks in mathematics (out of 50) of students in a class and answer the following questions.
 If the students have got the marks out of 50 and if A+ grade has been declared for above 90%, then the number of students who have got A+ grade is :

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On the basis of given graph in question ,
Number of students who score more than 90% = class – interval 45 – 50 = 10Correct Option: A
On the basis of given graph in question ,
Number of students who score more than 90% = class – interval 45 – 50 = 10
Therefore , correct answer is option A.
 The percentage of number of passed students is (31 is the pass marks)

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From the given above histogram , we can see
Total students ⇒ 135
Successful students ⇒ 20 + 40 + 50 + 10 = 120∴ Required percent = 120 × 100 35
Correct Option: D
From the given above histogram , we can see
Total students ⇒ 135
Successful students ⇒ 20 + 40 + 50 + 10 = 120∴ Required percent = 120 × 100 35 Required percent = 800 = 88 8 % 9 9
 The total number of students in the class is :

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From the given above histogram , we have
Number of students in the class interval 2530 = 15
Number of students in the class interval 3035 = 20
Number of students in the class interval 3540 = 40
Number of students in the class interval 4045 = 50
Number of students in the class interval 4550 = 10Correct Option: D
From the given above histogram , we have
Number of students in the class interval 2530 = 15
Number of students in the class interval 3035 = 20
Number of students in the class interval 3540 = 40
Number of students in the class interval 4045 = 50
Number of students in the class interval 4550 = 10
Total students in the class ⇒ 15 + 20 + 40 + 50 + 10 = 135
 If the pass marks in maths is 31, the number of students who failed in maths is :

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As per the given question , we can say that If the pass marks in maths is 31, the number of students who failed in maths classinterval 25–30 = 15
Correct Option: B
As per the given question , we can say that If the pass marks in maths is 31, the number of students who failed in maths classinterval 25–30 = 15
Therefore , required answer is 15 .
Direction: Study the following histogram of wage distribution of different number of workers and answer the given questions.
 The percentage of workers who earn between Rs. 950 to Rs. 960 is

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On the basis of given graph in question ,
Number of workers who earn between Rs. 950 to Rs.960 = 10
Total number of workers surveyed = 3 + 2 + 4 + 9 + 5 + 10 + 5 + 3 + 3 + 5 = 49Required percentage = Number of workers who earn between Rs. 950 to Rs.960 × 100 % Total number of workers surveyed
Correct Option: B
On the basis of given graph in question ,
Number of workers who earn between Rs. 950 to Rs.960 = 10
Total number of workers surveyed = 3 + 2 + 4 + 9 + 5 + 10 + 5 + 3 + 3 + 5 = 49Required percentage = Number of workers who earn between Rs. 950 to Rs.960 × 100 % Total number of workers surveyed Required percentage = 10 × 100 = 20.4% 49